From d890de10af6a4d01fe0b35f09ccd674d771e4732 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 15 Jul 2009 17:04:50 +0000
Subject: [PATCH] Add a raw_ostream version of CheckBitcodeOutputToConsole.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75796 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/SystemUtils.h | 10 ++++++++++
 lib/Support/SystemUtils.cpp        | 15 +++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/llvm/Support/SystemUtils.h b/include/llvm/Support/SystemUtils.h
index 9a33fa31f22..95124a047da 100644
--- a/include/llvm/Support/SystemUtils.h
+++ b/include/llvm/Support/SystemUtils.h
@@ -29,6 +29,16 @@ bool CheckBitcodeOutputToConsole(
   bool print_warning = true ///< Control whether warnings are printed
 );
 
+/// Determine if the raw_ostream provided is connected to the outs() and
+/// displayed or not (to a console window). If so, generate a warning message
+/// advising against display of bitcode and return true. Otherwise just return
+/// false
+/// @brief Check for output written to a console
+bool CheckBitcodeOutputToConsole(
+  raw_ostream* stream_to_check, ///< The stream to be checked
+  bool print_warning = true ///< Control whether warnings are printed
+);
+
 /// FindExecutable - Find a named executable, giving the argv[0] of program
 /// being executed. This allows us to find another LLVM tool if it is built into
 /// the same directory, but that directory is neither the current directory, nor
diff --git a/lib/Support/SystemUtils.cpp b/lib/Support/SystemUtils.cpp
index c86e200fd95..49a87e405ac 100644
--- a/lib/Support/SystemUtils.cpp
+++ b/lib/Support/SystemUtils.cpp
@@ -19,6 +19,21 @@
 #include <ostream>
 using namespace llvm;
 
+bool llvm::CheckBitcodeOutputToConsole(raw_ostream* stream_to_check,
+                                       bool print_warning) {
+  if (stream_to_check == &outs() &&
+      sys::Process::StandardOutIsDisplayed()) {
+    if (print_warning) {
+      cerr << "WARNING: You're attempting to print out a bitcode file.\n"
+           << "This is inadvisable as it may cause display problems. If\n"
+           << "you REALLY want to taste LLVM bitcode first-hand, you\n"
+           << "can force output with the `-f' option.\n\n";
+    }
+    return true;
+  }
+  return false;
+}
+
 bool llvm::CheckBitcodeOutputToConsole(std::ostream* stream_to_check,
                                        bool print_warning) {
   if (stream_to_check == cout.stream() &&